Remove usage of SingleThreadTaskRunner from DataReductionProxyConfig.

With the removal using the DataReductionProxyService class to perform the secure proxy check, there is no longer a need to post tasks to the UI thread.

This effectively makes DataReductionProxyConfig an IO thread only class, and does not need to have pointers to task runners.

BUG=472290

Review URL: https://codereview.chromium.org/1052583005

Cr-Commit-Position: refs/heads/master@{#327360}

7 files changed, 34 insertions, 59 deletions

diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
index 9b9ba22..fe8b897 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.cc
@@ -10,7 +10,6 @@
 #include "base/bind_helpers.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
-#include "base/single_thread_task_runner.h"
 #include "base/strings/string_util.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_configurator.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_config_values.h"
@@ -54,7 +53,8 @@ namespace data_reduction_proxy {
 // Checks if the secure proxy is allowed by the carrier by sending a probe.
 class SecureProxyChecker : public net::URLFetcherDelegate {
  public:
-  SecureProxyChecker(net::URLRequestContextGetter* url_request_context_getter)
+  SecureProxyChecker(const scoped_refptr<net::URLRequestContextGetter>&
+                         url_request_context_getter)
       : url_request_context_getter_(url_request_context_getter) {}
 
   void OnURLFetchComplete(const net::URLFetcher* source) override {
@@ -101,7 +101,6 @@ class SecureProxyChecker : public net::URLFetcherDelegate {
 };
 
 DataReductionProxyConfig::DataReductionProxyConfig(
-    scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
     net::NetLog* net_log,
     scoped_ptr<DataReductionProxyConfigValues> config_values,
     DataReductionProxyConfigurator* configurator,
@@ -112,24 +111,23 @@ DataReductionProxyConfig::DataReductionProxyConfig(
       enabled_by_user_(false),
       alternative_enabled_by_user_(false),
       config_values_(config_values.Pass()),
-      io_task_runner_(io_task_runner),
       net_log_(net_log),
       configurator_(configurator),
-      event_creator_(event_creator),
-      url_request_context_getter_(nullptr) {
-  DCHECK(io_task_runner);
+      event_creator_(event_creator) {
   DCHECK(configurator);
   DCHECK(event_creator);
+  // Constructed on the UI thread, but should be checked on the IO thread.
+  thread_checker_.DetachFromThread();
 }
 
 DataReductionProxyConfig::~DataReductionProxyConfig() {
   net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 }
 
-void DataReductionProxyConfig::InitializeOnIOThread(
-    net::URLRequestContextGetter* url_request_context_getter) {
-  DCHECK(url_request_context_getter);
-  url_request_context_getter_ = url_request_context_getter;
+void DataReductionProxyConfig::InitializeOnIOThread(const scoped_refptr<
+    net::URLRequestContextGetter>& url_request_context_getter) {
+  secure_proxy_checker_.reset(
+      new SecureProxyChecker(url_request_context_getter));
 
   if (!config_values_->allowed())
     return;
@@ -139,7 +137,7 @@ void DataReductionProxyConfig::InitializeOnIOThread(
 }
 
 void DataReductionProxyConfig::ReloadConfig() {
-  DCHECK(io_task_runner_->BelongsToCurrentThread());
+  DCHECK(thread_checker_.CalledOnValidThread());
   UpdateConfigurator(enabled_by_user_, alternative_enabled_by_user_,
                      restricted_by_carrier_, false /* at_startup */);
 }
@@ -147,6 +145,7 @@ void DataReductionProxyConfig::ReloadConfig() {
 bool DataReductionProxyConfig::WasDataReductionProxyUsed(
     const net::URLRequest* request,
     DataReductionProxyTypeInfo* proxy_info) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(request);
   return IsDataReductionProxy(request->proxy_server(), proxy_info);
 }
@@ -154,12 +153,14 @@ bool DataReductionProxyConfig::WasDataReductionProxyUsed(
 bool DataReductionProxyConfig::IsDataReductionProxy(
     const net::HostPortPair& host_port_pair,
     DataReductionProxyTypeInfo* proxy_info) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
   return config_values_->IsDataReductionProxy(host_port_pair, proxy_info);
 }
 
 bool DataReductionProxyConfig::IsBypassedByDataReductionProxyLocalRules(
     const net::URLRequest& request,
     const net::ProxyConfig& data_reduction_proxy_config) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(request.context());
   DCHECK(request.context()->proxy_service());
   net::ProxyInfo result;
@@ -176,6 +177,7 @@ bool DataReductionProxyConfig::AreDataReductionProxiesBypassed(
     const net::URLRequest& request,
     const net::ProxyConfig& data_reduction_proxy_config,
     base::TimeDelta* min_retry_delay) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
   if (request.context() != NULL &&
       request.context()->proxy_service() != NULL) {
     return AreProxiesBypassed(
@@ -231,6 +233,7 @@ bool DataReductionProxyConfig::IsProxyBypassed(
     const net::ProxyRetryInfoMap& retry_map,
     const net::ProxyServer& proxy_server,
     base::TimeDelta* retry_delay) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
   net::ProxyRetryInfoMap::const_iterator found =
       retry_map.find(proxy_server.ToURI());
 
@@ -247,6 +250,7 @@ bool DataReductionProxyConfig::IsProxyBypassed(
 
 bool DataReductionProxyConfig::ContainsDataReductionProxy(
     const net::ProxyConfig::ProxyRules& proxy_rules) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
   // Data Reduction Proxy configurations are always TYPE_PROXY_PER_SCHEME.
   if (proxy_rules.type != net::ProxyConfig::ProxyRules::TYPE_PROXY_PER_SCHEME)
     return false;
@@ -272,6 +276,7 @@ bool DataReductionProxyConfig::ContainsDataReductionProxy(
 
 bool DataReductionProxyConfig::UsingHTTPTunnel(
     const net::HostPortPair& proxy_server) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
   return config_values_->UsingHTTPTunnel(proxy_server);
 }
 
@@ -294,6 +299,7 @@ bool DataReductionProxyConfig::promo_allowed() const {
 
 void DataReductionProxyConfig::SetProxyConfig(
     bool enabled, bool alternative_enabled, bool at_startup) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   enabled_by_user_ = enabled;
   alternative_enabled_by_user_ = alternative_enabled;
   UpdateConfigurator(enabled_by_user_, alternative_enabled_by_user_,
@@ -317,7 +323,6 @@ void DataReductionProxyConfig::UpdateConfigurator(bool enabled,
                                                   bool alternative_enabled,
                                                   bool restricted,
                                                   bool at_startup) {
-  DCHECK(io_task_runner_->BelongsToCurrentThread());
   DCHECK(configurator_);
   LogProxyState(enabled, restricted, at_startup);
   // The alternative is only configured if the standard configuration is
@@ -375,7 +380,6 @@ void DataReductionProxyConfig::HandleSecureProxyCheckResponse(
     const std::string& response,
     const net::URLRequestStatus& status,
     int http_response_code) {
-  DCHECK(io_task_runner_->BelongsToCurrentThread());
   bool success_response = ("OK" == response.substr(0, 2));
   if (event_creator_)
     event_creator_->EndSecureProxyCheck(bound_net_log_, status.error(),
@@ -428,7 +432,6 @@ void DataReductionProxyConfig::HandleSecureProxyCheckResponse(
 }
 
 void DataReductionProxyConfig::OnIPAddressChanged() {
-  DCHECK(io_task_runner_->BelongsToCurrentThread());
   if (enabled_by_user_) {
     DCHECK(config_values_->allowed());
     RecordNetworkChangeEvent(IP_CHANGED);
@@ -484,7 +487,6 @@ void DataReductionProxyConfig::RecordSecureProxyCheckFetchResult(
 void DataReductionProxyConfig::SecureProxyCheck(
     const GURL& secure_proxy_check_url,
     FetcherResponseCallback fetcher_callback) {
-  DCHECK(io_task_runner_->BelongsToCurrentThread());
   bound_net_log_ = net::BoundNetLog::Make(
       net_log_, net::NetLog::SOURCE_DATA_REDUCTION_PROXY);
   if (event_creator_) {
@@ -492,10 +494,6 @@ void DataReductionProxyConfig::SecureProxyCheck(
         bound_net_log_, config_values_->secure_proxy_check_url());
   }
 
-  if (!secure_proxy_checker_) {
-    secure_proxy_checker_.reset(
-        new SecureProxyChecker(url_request_context_getter_));
-  }
   secure_proxy_checker_->CheckIfSecureProxyIsAllowed(secure_proxy_check_url,
                                                      fetcher_callback);
 }
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h
index 4499ee4..64f7589 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h
@@ -23,7 +23,6 @@
 class GURL;
 
 namespace base {
-class SingleThreadTaskRunner;
 class TimeDelta;
 }
 
@@ -90,7 +89,6 @@ class DataReductionProxyConfig
   // |config_values| contains the Data Reduction Proxy configuration values.
   // |configurator| is the target for a configuration update.
   DataReductionProxyConfig(
-      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
       net::NetLog* net_log,
       scoped_ptr<DataReductionProxyConfigValues> config_values,
       DataReductionProxyConfigurator* configurator,
@@ -98,8 +96,8 @@ class DataReductionProxyConfig
   ~DataReductionProxyConfig() override;
 
   // Performs initialization on the IO thread.
-  void InitializeOnIOThread(
-      net::URLRequestContextGetter* url_request_context_getter);
+  void InitializeOnIOThread(const scoped_refptr<net::URLRequestContextGetter>&
+                                url_request_context_getter);
 
   // Sets the proxy configs, enabling or disabling the proxy according to
   // the value of |enabled| and |alternative_enabled|. Use the alternative
@@ -270,10 +268,6 @@ class DataReductionProxyConfig
   // Contains the configuration data being used.
   scoped_ptr<DataReductionProxyConfigValues> config_values_;
 
-  // |io_task_runner_| should be the task runner for running operations on the
-  // IO thread.
-  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
-
   // The caller must ensure that the |net_log_|, if set, outlives this instance.
   // It is used to create new instances of |bound_net_log_| on secure proxy
   // checks. |bound_net_log_| permits the correlation of the begin and end
@@ -288,9 +282,6 @@ class DataReductionProxyConfig
   // The caller must ensure that the |event_creator_| outlives this instance.
   DataReductionProxyEventCreator* event_creator_;
 
-  // Used for performing the secure proxy check.
-  net::URLRequestContextGetter* url_request_context_getter_;
-
   // Enforce usage on the IO thread.
   base::ThreadChecker thread_checker_;
 
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.cc
index 43b5140..f614e93 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.cc
@@ -18,7 +18,6 @@ namespace data_reduction_proxy {
 TestDataReductionProxyConfig::TestDataReductionProxyConfig(
     int params_flags,
     unsigned int params_definitions,
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     net::NetLog* net_log,
     DataReductionProxyConfigurator* configurator,
     DataReductionProxyEventCreator* event_creator)
@@ -26,7 +25,6 @@ TestDataReductionProxyConfig::TestDataReductionProxyConfig(
           make_scoped_ptr(new TestDataReductionProxyParams(params_flags,
                                                            params_definitions))
               .Pass(),
-          task_runner,
           net_log,
           configurator,
           event_creator) {
@@ -34,12 +32,10 @@ TestDataReductionProxyConfig::TestDataReductionProxyConfig(
 
 TestDataReductionProxyConfig::TestDataReductionProxyConfig(
     scoped_ptr<DataReductionProxyConfigValues> config_values,
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     net::NetLog* net_log,
     DataReductionProxyConfigurator* configurator,
     DataReductionProxyEventCreator* event_creator)
-    : DataReductionProxyConfig(task_runner,
-                               net_log,
+    : DataReductionProxyConfig(net_log,
                                config_values.Pass(),
                                configurator,
                                event_creator) {
@@ -89,12 +85,10 @@ void TestDataReductionProxyConfig::SetStateForTest(
 
 MockDataReductionProxyConfig::MockDataReductionProxyConfig(
     scoped_ptr<DataReductionProxyConfigValues> config_values,
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     net::NetLog* net_log,
     DataReductionProxyConfigurator* configurator,
     DataReductionProxyEventCreator* event_creator)
     : TestDataReductionProxyConfig(config_values.Pass(),
-                                   task_runner,
                                    net_log,
                                    configurator,
                                    event_creator) {
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.h
index a07dc59..d5c4a49 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.h
@@ -5,16 +5,11 @@
 #ifndef COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_TEST_UTILS_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_TEST_UTILS_H_
 
-#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h"
 #include "net/base/net_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
-namespace base {
-class SingleThreadTaskRunner;
-}
-
 namespace net {
 class NetLog;
 }
@@ -36,7 +31,6 @@ class TestDataReductionProxyConfig : public DataReductionProxyConfig {
   TestDataReductionProxyConfig(
       int params_flags,
       unsigned int params_definitions,
-      scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
       net::NetLog* net_log,
       DataReductionProxyConfigurator* configurator,
       DataReductionProxyEventCreator* event_creator);
@@ -46,7 +40,6 @@ class TestDataReductionProxyConfig : public DataReductionProxyConfig {
   // DataReductionProxyParams or DataReductionProxyMutableConfigValues).
   TestDataReductionProxyConfig(
       scoped_ptr<DataReductionProxyConfigValues> config_values,
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
       net::NetLog* net_log,
       DataReductionProxyConfigurator* configurator,
       DataReductionProxyEventCreator* event_creator);
@@ -89,7 +82,6 @@ class MockDataReductionProxyConfig : public TestDataReductionProxyConfig {
   // Creates a |MockDataReductionProxyConfig|.
   MockDataReductionProxyConfig(
       scoped_ptr<DataReductionProxyConfigValues> config_values,
-      scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
       net::NetLog* net_log,
       DataReductionProxyConfigurator* configurator,
       DataReductionProxyEventCreator* event_creator);
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_unittest.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_unittest.cc
index 504d956..7a73126 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_unittest.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_unittest.cc
@@ -162,8 +162,8 @@ class DataReductionProxyConfigTest : public testing::Test {
       scoped_ptr<DataReductionProxyParams> params) {
     params->EnableQuic(false);
     return make_scoped_ptr(new DataReductionProxyConfig(
-        test_context_->task_runner(), test_context_->net_log(), params.Pass(),
-        test_context_->configurator(), test_context_->event_creator()));
+        test_context_->net_log(), params.Pass(), test_context_->configurator(),
+        test_context_->event_creator()));
   }
 
   MockDataReductionProxyConfig* config() {
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
index 37ecf96..9245544 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc
@@ -117,13 +117,12 @@ DataReductionProxyIOData::DataReductionProxyIOData(
     scoped_ptr<DataReductionProxyMutableConfigValues> mutable_config =
         DataReductionProxyMutableConfigValues::CreateFromParams(params.get());
     raw_mutable_config = mutable_config.get();
-    config_.reset(new DataReductionProxyConfig(
-        io_task_runner_, net_log, mutable_config.Pass(), configurator_.get(),
-        event_creator_.get()));
+    config_.reset(new DataReductionProxyConfig(net_log, mutable_config.Pass(),
+                                               configurator_.get(),
+                                               event_creator_.get()));
   } else {
     config_.reset(new DataReductionProxyConfig(
-        io_task_runner_, net_log, params.Pass(), configurator_.get(),
-        event_creator_.get()));
+        net_log, params.Pass(), configurator_.get(), event_creator_.get()));
   }
 
   // It is safe to use base::Unretained here, since it gets executed
@@ -146,7 +145,10 @@ DataReductionProxyIOData::DataReductionProxyIOData(
  }
 
  DataReductionProxyIOData::DataReductionProxyIOData()
-     : url_request_context_getter_(nullptr), weak_factory_(this) {
+     : client_(Client::UNKNOWN),
+       net_log_(nullptr),
+       url_request_context_getter_(nullptr),
+       weak_factory_(this) {
 }
 
 DataReductionProxyIOData::~DataReductionProxyIOData() {
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc
index f71ce8d..71dec53 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.cc
@@ -340,17 +340,15 @@ DataReductionProxyTestContext::Builder::Build() {
         DataReductionProxyMutableConfigValues::CreateFromParams(params.get());
     raw_mutable_config = mutable_config.get();
     config.reset(new TestDataReductionProxyConfig(
-        mutable_config.Pass(), task_runner, net_log.get(), configurator.get(),
+        mutable_config.Pass(), net_log.get(), configurator.get(),
         event_creator.get()));
   } else if (use_mock_config_) {
     test_context_flags |= USE_MOCK_CONFIG;
     config.reset(new MockDataReductionProxyConfig(
-        params.Pass(), task_runner, net_log.get(), configurator.get(),
-        event_creator.get()));
+        params.Pass(), net_log.get(), configurator.get(), event_creator.get()));
   } else {
     config.reset(new TestDataReductionProxyConfig(
-        params.Pass(), task_runner, net_log.get(), configurator.get(),
-        event_creator.get()));
+        params.Pass(), net_log.get(), configurator.get(), event_creator.get()));
   }
 
   scoped_ptr<DataReductionProxyRequestOptions> request_options;